Form 8.3 Disclosure by The Vanguard Group for Senior plc

The Vanguard Group, Inc. has submitted a Form 8.3 disclosure regarding its position in Senior plc. As per Rule 8.3 of the Takeover Code, this form reveals holdings or dealings in securities representing 1% or more.

The disclosure, dated April 2, 2026, highlights that The Vanguard Group holds 21,592,944 ordinary shares in Senior plc, representing a 5.15% stake. Additionally, a recent transaction involved the sale of 7,168 shares at a price of 2.90 GBP per unit.

No positions in cash-settled or stock-settled derivatives were disclosed. There are also no indemnity, option arrangements, or agreements related to future acquisitions or voting rights involving derivatives.

Shawn Acker is listed as the contact person for this disclosure. No supplemental forms are attached to this filing.